Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations cover the safety profile (readOnlyHint=false, idempotentHint=true, destructiveHint=false), and 'Update' is consistent with a mutation. The description adds only the vague 'privacy-filtered project metadata' hint and says nothing about what actually changes, what a validation failure does, or permission needs, so it contributes little beyond the annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

It is a single short sentence with no wasted words, but the brevity reflects under-specification rather than tight, informative framing. There is no front-loaded statement of what the tool concretely does.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 6-parameter mutation tool with a nested object, required idempotency key, and no output schema, a single vague sentence is insufficient. The description should explain what validation/update occurs and how the returned result should be interpreted.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100% and every parameter (including the nested 'details' object and idempotencyKey) is documented in the schema itself. The description adds no syntax or semantic detail beyond the schema, so the baseline of 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description restates the tool name with 'Update hosted validate node,' which is ambiguous: it is unclear whether the tool validates a node or mutates a node's validation state. No differentiation from siblings such as validate_project_graph, validation_read, or validation_write is offered.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no when-to-use, when-not-to-use, or alternative guidance. With closely related siblings (validate_project_graph, validation_write) present, the agent is left to guess which tool to invoke.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.